Water-meter.



PATENTED APR. 5, 1904.

J. THOMSON. WATER METER.

APPLIOATION FILED MAY 13, 1902. H0 MODEL. 4 SHEETS-SHEET 1.

Summon witnesses 110 MODEL.

PATENTED APR. 5, 1904. J. THOMSON.

WATER METER.

APPLICATION FILED MAY 13, 1902.

4 SHEETS-SHEET 2.

luwantoz I flttoanego No;756,431. I I PATENTED A RQ5 190'4.

J. THOMSON.

WATER METER.

APPLICATION mlnn m 13, 1902.

no MODEL. unmaqnnm'a.

grwanfo'c witness? 46 I attozvwlso No". 756,431. PATENTED APR.:5,1904. J. THOMSON.

WATER METER.

' APPLICATION rum) MAY 1a; 1902. Kb 101131.; 4 sums-$112314.

nun?? mum Snuutoz Witnesses I attaining:

gaww No: 756,431. v I ratentean rns, '1904.

UNITED STATES PATENT ()rticn,

JOHN THOMSON, OF BROOKLYN, NEW YORK.

.WATERF TEI-i.

srncrmonnon forming part of Letters Iatent- No. 756,431, dated Apri1 5, 1904.

'Applicationiiled. May13,1902 ses me. 107,133. (No model.)

' To all whom/it m y -1 a bearing for the Spindle 18. On this spindle 1 I Be it known that"l, JOHN THoMsoN, a citiare mounted two disks 19 20, having'helical zen of the United States, residing at Brookwings or blades, as 21, formed in orappli'ed to lyn, in the county of Kings and State of New their peripheries, the pitch of the helices in York, have invented certain new and useful one disk being right hand, while the pitch of 55 I Improvements in Water-Meters, ofwhich the the other is left hand. The weight of the o lowing isa specification. I revolving structure is supported by a suitable This invention relates to that type or class step-baring-say al roller-b'earing-as deof water-meters generally known as the innoted by 22. The outer edges of the helical IIO- ferential, the volume being inferred by as- I wings do not make contact with the wall'oi the 66 certaining and recording the velocity of flow cylinder, and the disks are so spaced upon the "through a portion of the meter. spindle as to form an intermediate chamber The particular objects ofthe invention are P.v The upper portions of the cylinder and tolobtain a high degree of sensibility, endure also its heads are provided with a series of -I5 ance, certainty of operation, compactness, openings or slots, as 24:, whose function is that 5 convenience; of inspection, and low cost of of, a strainer to prevent any materialv from construction I reaching the helices that cannot readily pass In the drawings, Figure 1 is' a vertical lonthrough the spaces between the blades. Por- I gitudinal center section of a meter showing tions of the'center of the interior cylinder an embodiment of my invention. Fig. 2 is aare cut away to form egress openings or portsrjo' I vertical transverse center section. Fig. 3 is' 25, leading',from'the intermediate chamberP. I a top plan view, the cover, being removed; and I The disks are hollow, and sealed water-tight, Fig. 4 is a horizontal center section. v: the compartments 26 being preferably so pro The principle of the indicating "device emportioned that the displacement will be such ployed to indicate the velocity, and hence the as will nearly but not quite cause the struc- 7 5 volume, is that of a helice or screw whose ture to float, thereby securingthe minimum axis coincides with the flowing stream and is of inertia to movement and imposing but little l causedto rotate on anaxis at'a right angle to duty upon the pivotal bearing of the spindle. the line of flow by the impact or friction of The, register E andv its internahreducing the moving water; I I 'gear trainI-Iare' mounted in the cap 27, the The invention is comprisedin thecombina primary pinion of. the gear-train being suittion and disposal of the apparatusand of the ably connected to be driven by thedisksyas water-chambersj-whereby to accomplish 'the by the driving-arm 28, actingin; the lot- 29 \objectsprimarilyandhereinafter-set forth. in the lupper end ofjthespindle.

35. The inflowingzstream.fromqthepipeatA is I 'As d' ow ilWfihQf rrows, theinflowing was I caused to divide and pass up'and down to the 'ter passesltojthef er and lowerchambers receiving-chambers B and C of the main or B C in relatively equally large and slow-mov-' external-casing 4.- v a v I ing volumesgand-thence through theslots'to I The interior ofcylinder 5 is mount-' "the upper face of" the upper disk and to. the edg areferably' vertically, in a bearing 6,. preflower faceof the lower disk.- Th ereafterthe' 9o erably tapered,-formedinthe upper and lower water flows in twostreams, one down and the partitions 7 8, which, with the end wall 8, form other up,"through the spaces between theheli .the outlet-chamber D. The casing rests on ces, thereby causing the disks, "the-spindle,

I the shoulder 9 and is secured against acci- -andthe register torevolve. fThetwo-streams, .45 dental displacement upwardly by the screw* onfromaboveand the other from below, af- 9'5 10. Mounted in the ends of the cylinderare ter'passingthe blades of right and left hand two heads 12 13, secured thereto by the pitch impinge uponandreact against each screws or pins 14. Each, head has-an in other in the 'intermediate;chamber P, theresrdlyaproiectipg hub15 16. which arepref' after flowing through the ports 25 to the 5 er iblybufi edmswitliha-rd rubber 17, to forfn ontlet chamber D and onto the pipe. It will .Ioo

thus be seen that the hydraulic conditions, as to the effect of the flow upon the friction of the spindle, are such as to precisely neutralize or balance each other.

To realize the advantage thus pointed out, -it is desirable that the form of the strainer slots or openingsshall be a duplicate of the other both as to the contour of the several slots and as to their disposal and aggregate area in chambers B and C in that the condition of flow and supply to the helical spaces in the disks shall be practically identical.

In consequence of supplying the two chambers Band C with a large volume at low velocity and slight loss of head it is feasible to concentrate the obstruction to the flow at the helical spaces of the disks, thereby deriving high velocity of impact upon the blades,where by to increase the sensibility of the meter at the lower rates of flow.

Particular attention is directed to the contained and counterbalanced strains, that the spindle is not required to resist any thrust due to hydraulic action in any direction,: and that by simply removing the cap the interior casing and its contained apparatus complete and self-contained may quickly be withdrawn for 'i'nspectionor substitution without removing the, main casing from the circuit or disturbing the pipe. So, too, an exceedingly important hydraulic advantage is derived from placing all of the restricted water-passages in the single cylinder 5, which may thus be accurately formed to such contours as will produce conditions of. flow most favorable to uni-. 'formity of registration at varying rates of drafts. In other words, both the hydrostatic and hydraulic conditions irrespective of the degree of pressure or the rate of velocity are precisely similar in the delivery-chambers B and C, and the same holds good as to the two streamswhich pass through the helical spaces of the disks 19 20, unite, and pass on under precisely the same conditions of obstruction.

I do not limit myself to the exact arrange-- ment and mode of operation herein described.

Thus it is feasible-and in some instances may be desirable to reverse the direction of the flow receiving at chamber I) and discharging into A, which obviously would not materially detract fromseveral of the advantagesof operation described.

I claim 1. In a water-meter, the combination with helical blades, one of left-hand andthe otherof right-hand pitch, portions of the cylinder being cut away near its center to form egressports, and the upper and lower portions of the cylinder being provided with slots, the arrangement and construction being such that the water from the upper and lower receiving-chambers is delivered to the disks and discharged into the intermediate chamber be tween the disks, substantially as described.

2. The combination with the chambers B andC, of the cylinder and its heads with-reits bearing-heads of the right and left hand pitch helical disks ahd their spindle, the said disks having sealed compartments of such capacity as to render the revolving structure nearly buoyant, substantially as and for the purpose set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnessesl JOHN THOMSON.

VYitnesses:

J our: McKmNoN, LEWIS MORTIMER. 

